Multiple NSPopover ecrasing each other - objective-c

Question

I'm trying to put two NSPopover on two Help Buttons on a .xib file.
To do so, I declared in my .h
#interface ExportPreferences : NSPreferencePane <NSPopoverDelegate>
{
NSWindow *window;
NSPopover *popover;
NSUserDefaults *prefs;
NSMutableArray *myArran;
IBOutlet NSButton *images;
IBOutlet NSPopUpButton *modalities;
IBOutlet NSPathControl *path;
IBOutlet NSPopUpButton *tree;
IBOutlet NSPopUpButton *extension;
}
#property (assign) IBOutlet NSWindow *window;
#property (assign) IBOutlet NSPopover *popover;
#end
And two different methods in my .m :
- (IBAction) showInfoTreePopover {
[[self popover] showRelativeToRect:[sender bounds] ofView:sender preferredEdge:NSMaxXEdge];
}
- (IBAction) showInfoTypePopover {
[[self popover] showRelativeToRect:[sender bounds] ofView:sender preferredEdge:NSMaxXEdge];
}
Then, in my .xib I declared
A Popover with its Popover View Controller
A Custom View
A Label (on the CV)
And I linked :
The Help Button to its corresponding method (one for the Tree, one for the Type)
The File's Owner to the Popover
The Popover View Controller to the Custom View
Since I do have two NSPopover to implement, I did all of this twice, two Popover, two Popover View Controller, two Custom View, two labels.
When I compile, everything goes right, but when I test it, it appears that only my second Popover shows up on the two buttons. It seems that implementing the second Popover, erased the first one.
how may I patch that ?

Answer 1

Alright, I answered my own question but I think I might give the answer if anyone faces the same problem.
When using two NSPopovers, I had to declare two different Outlets,
NSPopover *treePopover;
NSPopover *typePopover;
Also, two properties
#property (assign) IBOutlet NSPopover *treePopover;
#property (assign) IBOutlet NSPopover *typePopover;
And now, the linking works perfectly.